FE usage of the inbox subcollection

[elatif2020]

Currently the FE is subscribing to the feedItemFollows subscollection and skipping the inbox subcollection.
However they are different and will be different especially once we start using the linked streams feature.
So we should change to subscribing the inbox subcollection instead.
If needed we might ask the BE to add additional information there to make the loading more efficient.

[elatif2020]

@andreymikhadyuk @danielr18 we can discuss additional details here

[andreymikhadyuk]

We need to change useInboxItems hook to start subscribing directly to the inbox items instead of feed item follow and chat channels. I do not think that something should be done from the BE side here.

[andreymikhadyuk]

@danielr18 I get such error when trying to subscribe to inbox collection or trying to get data from that collection:

Here are the methods I use.